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相对于缓倾斜和近水平煤层而言,大倾角煤层开采后覆岩结构特征有所不同,研究大倾角煤层开采覆岩结构特征,对现场实践和安全生产具有重要的指导意义。针对霍州矿区庞庞塔5-103工作面,采用数值计算软件FLAC3D、UDEC分别模拟了不同倾角下煤层开采过程中应力场的演化以及覆岩的破坏过程。通过对比分析,总结了随倾角变化应力场、“三带”的演化特征及煤壁、底板的破坏规律。
Compared with gently inclined and near horizontal coal seams, the structural characteristics of overlying strata after mining in deep inclined coal seam are different. Studying the structural characteristics of overlying strata in mining large angle coal seams has important guiding significance for on-site practice and safety production. Aiming at the 5-103 face of Pangpupta in Huozhou Mining Area, numerical simulation software FLAC3D and UDEC were used to simulate the evolution of stress field and the failure process of overlying strata during coal mining under different dip angles respectively. Through comparative analysis, the evolvement characteristics of the stress field along with the dip angle, the “three zones” and the failure rules of coal wall and floor are summarized.